According to the S&W CW-5000 Series Chiller User Manual, the CW-5000 series chillers have a reservoir capacity of 6L or 1.58503 US gallons:
Here are the volume calculations using the external dimensions of the tubes. The tube is actually a hollow cylinder and I could have calculated it more accurately as such, but the difference should be close enough to account for the plumbing.
|MACHINE WATTAGE||TUBE DIMS (mm)||TOTAL VOLUME (US Gallons)|
|60||1250mm X 55mm||0.78|
|80||1250mm X 80mm||1.66|
|100||1460mm X 80mm||1.93|
|130||1650mm X 80mm||2.19|
Here are the approximate total system coolant capacities by wattage as derived from the above information.
|MACHINE WATTAGE||APPROX. TOTAL COOLANT SYSTEM VOLUME (US Gal.)|
These sound a bit high to me so i will separately calculate as a hollow cylinder and factor in the plumbing to see if there is much difference (as time allows).